[Bug 10866] In-game text slows down SimCopter

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=10866





--- Comment #2 from Roderick Colenbrander <thunderbird2k at gmx.net>  2007-12-29 09:49:57 ---
You are correct on the problem. Normally ddraw or direct3d games just render to
the screen. The evilness of ddraw/d3d is that both export a 'GetDC' function
which games can use to mix GDI with ddraw/d3d. In case of games on wine this is
the most terrible thing a game can do. As what happens is that each GetDC call
the whole framebuffer contents is downloaded and put in a sort of 'bitmap'.
Then it is handled to GDI for drawing to it. Behind your back GDI uses X for
drawing and this is quite inefficient.

Some time in the future we will get a 'DIB' engine in wine and when we have
that the GDI drawing can be done without X and this will make it quite a bit
faster but the costly download is still needed. (In case of gdi there is no
download only in case of opengl; in gdi only the final result is shown on the
screen, so all data is still on the cpu-side)


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